TY  - JOUR
AU  - Colbourn, Charles J.
AU  - Rosa, Alexander
AU  - Stinson, Douglas R.
TI  - Pairwise Balanced Designs with Block Sizes Three and Four
JO  - Canadian journal of mathematics
PY  - 1991
SP  - 673
EP  - 704
VL  - 43
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-039-9/
DO  - 10.4153/CJM-1991-039-9
ID  - 10_4153_CJM_1991_039_9
ER  -